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EP3986011B1 - Système d'antenne distribuée, procédé et appareil - Google Patents

Système d'antenne distribuée, procédé et appareil

Info

Publication number
EP3986011B1
EP3986011B1 EP19933068.9A EP19933068A EP3986011B1 EP 3986011 B1 EP3986011 B1 EP 3986011B1 EP 19933068 A EP19933068 A EP 19933068A EP 3986011 B1 EP3986011 B1 EP 3986011B1
Authority
EP
European Patent Office
Prior art keywords
radio frequency
digital
analog
frequency signal
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19933068.9A
Other languages
German (de)
English (en)
Other versions
EP3986011A4 (fr
EP3986011C0 (fr
EP3986011A1 (fr
Inventor
Manjiang LUO
Qiyan FAN
Hang Zhang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Comba Network Systems Co Ltd
Original Assignee
Comba Network Systems Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Comba Network Systems Co Ltd filed Critical Comba Network Systems Co Ltd
Priority to RS20250984A priority Critical patent/RS67264B1/sr
Publication of EP3986011A1 publication Critical patent/EP3986011A1/fr
Publication of EP3986011A4 publication Critical patent/EP3986011A4/fr
Application granted granted Critical
Publication of EP3986011C0 publication Critical patent/EP3986011C0/fr
Publication of EP3986011B1 publication Critical patent/EP3986011B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25752—Optical arrangements for wireless networks
    • H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07955—Monitoring or measuring power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/564—Power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/006—Devices for generating or processing an RF signal by optical means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a distributed antenna system and a signal transmission method.
  • the new digital indoor distribution system has advantages of simple deployment, low construction difficulty, flexible expansion, convenient operation and maintenance and the like, and greatly improves network capacity.
  • the distributed antenna system includes a digital-analog expansion unit and a remote cascade chain, the remote cascade chain includes a plurality of remote units cascadingly connected by means of radio frequency cable, and a first remote unit of the remote cascade chain is connected to the digital-analog expansion unit by means of radio frequency cable.
  • the digital-analog expansion unit is configured to perform a baseband processing operation on a received external signal through a first baseband processing module inside the digital-analog expansion unit, and to perform interconversion of an analog radio frequency signal and a digital radio frequency signal through a first signal conversion module inside the digital-analog expansion unit, to obtain an uplink digital radio frequency signal to be transmitted to a source unit or a downlink analog radio frequency signal to be transmitted to the remote cascade chain.
  • the remote unit is configured to perform analog radio frequency signal interaction with a terminal device, and two adjacent remote units perform analog radio frequency signal interaction by means of the radio frequency cable.
  • the digital-analog expansion unit and the remote units use a cable connection-based daisy chain topology, which can both increase transmission bandwidth and effectively decrease transmission link costs.
  • baseband processing being executed by the digital-analog expansion unit, and a remote unit not requiring baseband processing equipment can effectively lower system component costs and operating power consumption.
  • coverage of the remote unit is not limited by bandwidth and the remote unit supports a plurality of signal access coverage.
  • the present system is characterized by multi-mode, multi-band support and cell splitting, is easy to expand, and has low construction difficulty.
  • first port when one element is considered to be “connected to” another element, it may be directly connected to and integrated with the other element or an intermediate element may co-exist.
  • first port when one element is considered to be “connected to” another element, it may be directly connected to and integrated with the other element or an intermediate element may co-exist.
  • first port when one element is considered to be “connected to” another element, it may be directly connected to and integrated with the other element or an intermediate element may co-exist.
  • first port first transport port
  • another end and similar expressions used herein are for illustrative purposes only.
  • an indoor coverage scheme is mainly to use outdoor macro station signals for indoor coverage, and/or adopt a conventional indoor distributed antenna system (DAS) (namely, a remote radio unit (RRU) is used as a source for indoor signal coverage using feeders and indoor distributed antennas), which can solve the problem of signal coverage and satisfy voice services.
  • DAS distributed antenna system
  • RRU remote radio unit
  • the new digital indoor distribution system introduced in the 4G era has advantages of simple engineering implementation, visual operation and maintenance, simple implementation of multi-channel MIMO, easy expansion and evolution, and the like.
  • construction costs of the new digital indoor distribution system are several times higher than those of the conventional DAS.
  • all the new digital indoor distribution systems are active systems, and digital signals are transmitted through network cables or optical fibers, which requires huge energy consumption.
  • the bandwidth is limited by rates of optical modules or network cables.
  • a transmission bandwidth is required to increase proportionally, and a performance-matching device (such as an analog-to-digital converter (ADC))/a digital to analog converter (DAC))/a field-programmable gate array (FPGA)) is used for processing, with costs and power consumption also increased greatly.
  • ADC analog-to-digital converter
  • DAC digital to analog converter
  • FPGA field-programmable gate array
  • a digital-analog expansion unit configured for baseband processing and signal conversion is arranged between a source unit and a remote unit, to form a three-layer structure of the source unit, the digital-analog expansion unit and the remote unit.
  • the digital-analog expansion unit cascades a plurality of remote units by using radio frequency cable, to form a daisy chain topology. Costs of remote coverage can be effectively reduced while the bandwidth is increased.
  • the system supports a plurality of signal access coverage, and is characterized by multi-mode, multi-band support, expansion and cell splitting.
  • the system adopts a digital-analog hybrid transmission manner, which has advantages of simple engineering implementation, controllable management, multi-channel MIMO and convenient expansion, and meanwhile, may also avoid disadvantages of high construction costs, high power consumption and limited transmission bandwidth.
  • the distributed antenna system includes at least one digital-analog expansion unit connected to a source unit and at least two remote units.
  • a daisy chain topology connection structure is adopted between the remote units, to form a remote cascade chain.
  • the remote unit at a head end of the remote cascade chain is connected to the digital-analog expansion unit by means of radio frequency cable.
  • the digital-analog expansion unit may be connected to at least one remote cascade chain.
  • the distributed antenna system may include at least two digital-analog expansion units.
  • a star topology connection structure and/or a daisy chain topology connection structure may be adopted between one source unit and a plurality of digital-analog expansion units. It is to be noted that the daisy chain topology mentioned in the embodiment of the present application is a linear daisy chain topology.
  • the digital-analog expansion unit may be connected to the source unit through an optical fiber, and use digital optical fiber transmission to diversify source access.
  • the source unit may be a building base band unit (BBU) or a radio remote unit (RRU).
  • the digital-analog expansion unit is connected to the remote cascade chain by means of radio frequency cable.
  • the digital-analog expansion unit can couple a power signal, a monitoring signal and the like in the radio frequency cable.
  • the remote unit may obtain the power signal and the like by coupling from the radio frequency cable, and then realize active amplification of a radio frequency signal. On this basis, a number of the remote units on the remote cascade chain may be set according to an actual signal coverage requirement.
  • the digital-analog expansion units are each connected to eight remote units, in the embodiment of the present application, since the digital-analog expansion unit is connected to the source unit by using an optical fiber and may be cascaded with another digital-analog expansion unit, a single digital-analog expansion unit requires two optical fiber interfaces.
  • the expansion unit in the new digital indoor distribution system requires an optical fiber interface connected to the source unit, an optical fiber interface cascaded with the expansion unit and eight optical fiber interfaces or network cable interfaces connected to the remote units. With the requirement for a large bandwidth, costs of each interface device are increased accordingly. Therefore, according to the embodiment of the present application, the interface devices may be saved and the costs may be reduced.
  • radio frequency signals are required to be digitized and then transmitted through a common public radio interface (CPRI) protocol, which greatly limits a digital transmission bandwidth.
  • CPRI public radio interface
  • the remote unit realizes coverage of signals of 4T4R MIMO and 100 MHz (megahertz) bandwidth.
  • 122.88 MHz denotes a transmission rate of a 100 MHz bandwidth signal
  • 2 denotes IQ channels
  • 15 denotes a transmission bit width
  • 16/15 denotes a transmission control overhead
  • 10/8 denotes transmission code
  • 4 denotes a number of antennas.
  • the conventional DAS uses a 7/8 feeder with low insertion loss as a transmission medium, but its weight and diameter are large. At the same time, under the requirement of using 4T4R, four 7/8 feeders are required, which leads to difficult construction and high costs.
  • radio frequency cable with a small diameter and a light weight may be used as a transmission medium. Meanwhile, the remote unit may compensate for the insertion loss in radio frequency transmission through active radio frequency amplification. Due to the small diameter, a plurality of radio frequency cables may be bundled and combined into one cable for easy construction. As shown in FIG. 8 , four radio frequency cables are combined into one bundling radio frequency cable, which can meet the requirement of 4T4R.
  • the digital-analog expansion unit includes a first optical transceiver module, a first baseband processing module, a first signal conversion module and a radio frequency front end module successively connected.
  • the first optical transceiver module is configured to perform optical signal interaction with the source unit.
  • the first baseband processing module is configured to perform baseband processing on a received signal and then output the signal.
  • the first signal conversion module is configured to perform digital radio frequency signal interaction with the baseband processing module and perform analog radio frequency signal interaction with the radio frequency front end module.
  • the radio frequency front end module is configured to perform analog radio frequency signal interaction with the remote unit and configured to perform analog radio frequency signal processing.
  • the first baseband processing module may be configured to perform baseband processing on the digital radio frequency signal transmitted by the first optical transceiver module and transmit the processed digital radio frequency signal to the first signal conversion module.
  • the first baseband processing module may be further configured to process a digital radio frequency signal transmitted by the first optical transceiver module and transmit the processed digital radio frequency signal to the first optical transceiver module.
  • the first baseband processing module processes the digital radio frequency signal in any one or any combination of the following manners: digital combination, signal framing, signal deframing, serial-to-parallel conversion, parallel-to-serial conversion, clock recovery, digital intermediate frequency processing and the like.
  • the first baseband processing module may be an FPGA, an ASIC or the like, which is not specifically limited herein.
  • the radio frequency front end module may be configured to process the analog radio frequency signal transmitted by the first signal conversion module and then transmit it to the remote cascade chain, and may be further configured to process an analog radio frequency signal transmitted by the remote cascade chain and then transmit it to the first signal conversion module.
  • the radio frequency front end module processes the analog radio frequency signal in any one or any combination of the following manners: filtering, frequency conversion, amplification and the like.
  • the radio frequency front end module may include a filter, an inverter, an amplifier, and the like, which is not specifically limited herein.
  • a plurality of processing channels may be arranged inside each of the first baseband processing module, the first signal conversion module and the radio frequency front end module, and configured to process signals of a plurality of communication channels, so as to meet communication requirements, such as 2T2R and 4T4R.
  • the source unit may be connected to other digital-analog expansion units through one of the digital-analog expansion units to realize signal interaction among the digital-analog expansion units.
  • the number of optical ports required by the source unit may be reduced, thereby reducing construction costs of the system.
  • a star topology, a daisy chain topology, and a hybrid topology of star and daisy chain may be formed between the source unit and the digital-analog expansion unit.
  • the digital-analog expansion unit may broadcast a downlink digital radio frequency signal transmitted by the source unit to the digital-analog expansion unit of next cascade, and may also transmit an uplink optical signal obtained by itself to the source unit through the digital-analog expansion unit of the previous cascade.
  • the digital-analog expansion unit may be connected to a plurality of remote cascade chains to transmit analog radio frequency signals with the remote cascade chains.
  • the first remote unit of each remote cascade chain is connected to the radio frequency front end module of the digital-analog expansion unit.
  • the radio frequency front end module may arrange a corresponding signal processing channel for each remote cascade chain.
  • the digital-analog expansion unit may be expanded to connect a plurality of remote cascade chains, which enables flexible design of signal coverage, meets layout requirements of a variety of indoor structures, and has high applicability.
  • the digital-analog expansion unit may receive signals of the remote cascade chains connected thereto and signals of the cascaded digital-analog expansion units, and digitally combine, according to signal features, signals having the same signal feature in the multi-channel signals, thereby reducing the bandwidth occupied by the signal when transmitted to the source unit and improving the utilization of the transmission medium and the device.
  • the signal feature includes any one or any combination of the following parameters: standard, frequency band, cell and the like.
  • a lower-stage digital-analog expansion unit transmits an uplink digital radio frequency signal obtained to a current digital-analog expansion unit through an optical fiber. If the transmitted uplink digital radio frequency signal has a same feature (such as a same standard, a same frequency band or a same cell) as an uplink digital radio frequency signal obtained by the current digital-analog expansion unit by processing, digital addition (belonging to digital combination) is required, and then an uplink digital radio frequency signal obtained by addition is converted into an optical signal and transmitted to the upper-stage digital-analog expansion unit or the source unit.
  • a same feature such as a same standard, a same frequency band or a same cell
  • the signal transmitted from the lower stage is required to be transmitted to the upper-stage digital-analog expansion unit or the source unit in the pass-though manner. If the signal transmitted from the lower stage may be digitally added, the bandwidth transmitted by the current digital- analog expansion unit to the upper stage is not occupied. If the signal transmitted from the lower stage is required to be transmitted to the upper stage in the pass-though manner, the signal is required to occupy an extra transmission bandwidth.
  • the signal feature may be a signal standard, frequency band, cell or the like. It is to be noted that the signal feature does not relate to information content carried by the signal.
  • the digital-analog expansion unit further includes a first monitoring circuit, a power supply circuit and a first coupler that is connected to the first remote unit of the remote cascade chain by means of radio frequency cable.
  • the power supply circuit is configured to generate a power signal and couple it to the radio frequency cable through the first coupler to provide a power signal for each remote unit, so as to facilitate the remote unit to amplify the radio frequency signal.
  • the first baseband processing module may be further configured to generate uplink and downlink switching signals which are coupled to the radio frequency cable through the first coupler, thereby driving the remote unit to realize time division duplexing (TDD) coverage.
  • the first coupler is configured to couple the downlink analog radio frequency signal, the uplink and downlink switching signals, the power signal, the monitoring signal and the like to the radio frequency cable, to facilitate the remote units in the remote cascade chain to couple out corresponding signals in the radio frequency cable.
  • the digital-analog expansion unit may couple a plurality of signals to the radio frequency cable through the coupler, which facilitates each remote unit to acquire the signal, enriching the functionality of the remote unit and reducing the system's demand for the transmission medium.
  • baseband processing of the current digital-analog expansion unit involves acquiring a digital radio frequency signal from the source unit or the upper-stage digital-analog expansion unit through the optical transceiver, which, after processing such as clock recovery, series-to-parallel conversion, deframing, rate conversion and digital up conversion, is transmitted to the digital-to-analog converter to be converted into an analog radio frequency signal, transmitted to the radio frequency front end module, after processing such as filtering, frequency conversion, and amplification, transmitted to the multiplexer, coupled through the first coupler and then fed into the radio frequency cable.
  • the first coupler obtains the analog radio frequency signal by coupling from the radio frequency cable, which is filtered by the multiplexer and then enters the radio frequency front end for amplification, filtering and frequency conversion.
  • the radio frequency signal processed by the radio frequency front end is converted into a digital radio frequency signal through the analog-to-digital converter, which is photoelectrically converted after baseband processing such as digital down conversion (DDC), rate conversion, framing, and parallel-to-series conversion, converted into an optical signal and then transmitted to the upper-stage digital-analog expansion unit or the source unit.
  • DDC digital down conversion
  • rate conversion rate conversion
  • framing framing
  • parallel-to-series conversion converted into an optical signal and then transmitted to the upper-stage digital-analog expansion unit or the source unit.
  • the remote unit includes at least one communication link module.
  • Two adjacent remote units are connected through a plurality of radio frequency cables, and may be preferably connected through a bundling cable.
  • the bundling radio frequency cable includes at least one radio frequency cable, and one radio frequency cable is correspondingly connected to one communication link module of a lower-stage remote unit.
  • the communication link module includes a second coupler, a radio frequency interaction circuit, a second monitoring circuit, a power conversion circuit and an uplink and downlink switching circuit.
  • the second coupler is connected to the first coupler or a communication link module of an upper-stage remote unit by means of radio frequency cable.
  • the second coupler is connected to the radio frequency interaction circuit, the second monitoring circuit, the power conversion circuit and the uplink and downlink switching circuit.
  • the radio frequency interaction circuit is connected to the power conversion circuit and the uplink and downlink switching circuit.
  • the second coupler is configured to perform at least one of operations including: acquiring a power signal, acquiring an uplink and downlink switching signal, performing monitoring signal interaction with the digital-analog expansion unit, performing analog radio frequency signal interaction with the digital-analog expansion unit, and performing analog radio frequency signal interaction with the lower-stage remote unit.
  • the communication link module includes a second coupler connected to the radio frequency cable and configured to perform analog radio frequency signal transmission with the first coupler, the communication link module of the upper-stage remote unit or the communication link module of the lower-stage remote unit.
  • the second coupler has a first port connected to the first coupler or the communication link module of the upper-stage remote unit by means of radio frequency cable, a second port connected to the communication link module of the lower-stage remote unit, and a third port connected to the radio frequency interaction circuit, the second monitoring circuit, the power conversion circuit and the uplink and downlink switching circuit in the communication link module.
  • the radio frequency interaction circuit is configured to perform radio frequency signal interaction with an external terminal, and may include devices such as a filter, an amplifier and an antenna. Specifically, the radio frequency interaction circuit may obtain an analog radio frequency signal from the radio frequency cable through the second coupler, which is transmitted out by the antenna after processing such as filtering and amplification. The radio frequency interaction circuit may also acquire an analog radio frequency signal transmitted by the external terminal through the antenna, which, after processing such as filtering and amplification, is coupled to the radio frequency cable through the second coupler and is then transmitted to the digital-analog expansion unit.
  • the second monitoring circuit may be configured to acquire a monitoring signal through the second coupler and perform processing, and may further feed back a monitoring signal through the second coupler, to realize monitoring signal interaction between the remote unit and the digital-analog expansion unit.
  • the second monitoring circuit may be a circuit generating and processing a low-speed radio frequency signal, such as a bluetooth signal or an FSK signal.
  • the second monitoring circuit may feed back state information, device information, alarm information or the like of a current remote unit through the monitoring signal.
  • the second monitoring circuit may include a second processor and a second bluetooth chip connected between the second processor and the second coupler.
  • the second processor may be connected to an attenuator of the radio frequency interaction circuit to control an attenuation value in the radio frequency interaction circuit.
  • the power conversion circuit may be configured to acquire a power signal through the second coupler, and convert the power signal to obtain a standard power supply required by each device in the remote unit, thereby meeting active amplification of the radio frequency interaction circuit.
  • a coupling voltage on the radio frequency cable is generally 48 V (volts) and is required to be converted into 5 V, 3.3 V or the like.
  • the uplink and downlink switching circuit may be configured to acquire uplink and downlink switching signals through the second coupler, and control uplink and downlink switching of the radio frequency interaction circuit, so as to realize coverage of TDD-standard signals.
  • the uplink and downlink switching signals may also be directly extracted from the analog radio frequency signal.
  • the remote unit in the embodiment of the present application may obtain the downlink analog radio frequency signal, the monitoring signal, the power signal and the like by coupling from the radio frequency cable through the coupler, to realize signal coverage.
  • the device has a simple structure and low costs, and facilitates expansion of the system.
  • the remote unit is further configured to: acquire a first uplink analog radio frequency signal of the terminal and a second uplink analog radio frequency signal transmitted by a lower-stage remote unit, and combine the first uplink analog radio frequency signal with the second uplink analog radio frequency signal to obtain an uplink analog radio frequency signal of a current remote unit; and transmit the uplink analog radio frequency signal to an upper-stage remote unit or the digital-analog expansion unit.
  • the current remote unit acquires the uplink analog radio frequency signal of the external terminal through radio frequency interaction.
  • the current remote unit further acquires the uplink analog radio frequency signal transmitted by the lower-stage remote unit, combines the acquired uplink analog radio frequency signals, and transmits the combined uplink analog radio frequency signal to the upper-stage remote unit or the digital-analog expansion unit, to realize transmission of uplink radio frequency signals.
  • the distributed antenna system further includes the source unit connected to the digital-analog expansion unit.
  • the access unit further converts the digital radio frequency signal of the digital-analog expansion unit into an analog radio frequency signal and transmits it to the RRU.
  • the access unit is further configured to perform a baseband processing operation on various external signals, for example, deframe, digitally combine, frame and perform digital intermediate frequency processing on the digital radio frequency signal.
  • the access unit can deframe, combine and convert the signals transmitted by a plurality of digital-analog expansion units and then transmit, through the corresponding radio frequency cables, a plurality of analog radio frequency signals obtained to the RRU for processing.
  • the access unit may also convert, perform intermediate frequency processing on and frame a plurality of analog radio frequency signals transmitted by the RRU and then transmit them to the digital-analog expansion units through optical ports.
  • the access unit includes a second optical transceiver module, a second baseband processing module, a second signal conversion module and a radio frequency channel module successively connected.
  • the second optical transceiver module is configured to perform optical signal interaction with the digital-analog expansion unit.
  • the second baseband processing module is configured to perform baseband processing on a received signal and then output the signal.
  • the second signal conversion module is configured to perform digital radio frequency signal interaction with the second baseband processing module and perform analog radio frequency signal interaction with the radio frequency channel module.
  • the radio frequency channel module is configured to perform analog radio frequency signal interaction with the RRU and configured to perform analog radio frequency signal processing.
  • the digital-analog expansion unit and the remote units use a cable connection-based daisy chain topology, which can both increase transmission bandwidth and effectively decrease transmission link costs.
  • baseband processing being executed by the digital-analog expansion unit, and a remote unit not requiring baseband processing equipment can effectively lower system component costs and operating power consumption.
  • coverage of the remote unit is not limited by bandwidth and the remote unit supports a plurality of signal access coverage.
  • the present system is characterized by multi-mode, multi-band support and cell splitting, is easy to expand, and has low construction difficulty.
  • a signal transmission method is provided.
  • the signal transmission method is applicable to the distributed antenna system described above, and includes the following steps.
  • the remote unit acquires a first uplink analog radio frequency signal of a terminal and a second uplink analog radio frequency signal transmitted by a lower-stage remote unit.
  • a 4T4R antenna is mainly used for 5G indoor distribution
  • the 4T4R antenna has a bandwidth of at least 100 MHz, for example, a bandwidth of 160 MHz for 2.6 G frequency band, a bandwidth of 200 MHz for 3.5 G frequency band, and both the 2.6 G and 3.5 G frequency bands are TDD signals.
  • the communication system may include one source unit, four digital-analog expansion units and thirty-two remote units.
  • the source unit may be a BBU, or may mainly include an RRU and an access module.
  • Each base station unit, that is, source unit is connected to four digital-analog expansion units.
  • Each digital-analog expansion unit is connected to eight remote units.
  • all cables on 4T4R communication links are bundling cables including four subcables, each of which is configured to realize 1T1R antenna radio frequency transmission.
  • the configuration of the remote unit is as shown in FIG. 12 , including four communication link modules corresponding to the subcables respectively.
  • each subcable in the bundling cable may be correspondingly connected to one coupler when connected to the remote unit.
  • the remote unit may couple signals in the subcables.
  • the signal in the cable passing through the coupler has relatively low power insertion loss, and may be transmitted to the lower-stage remote unit through the cable.
  • a downlink radio frequency signal is coupled out of the coupler, then passes through a filter (a TDD signal is a filter), is amplified by a power amplifier, and is then filtered and transmitted from the antenna.
  • An uplink radio frequency signal is received from the antenna, filtered by the filter, amplified by a low noise amplifier, filtered by the filter, and coupled from the coupler to the bundling cable.
  • the other channel passes through a framing module, and after addition of some control information, is transmitted transparently to the cascade optical port.
  • Four uplink signals undergo corresponding radio frequency front end processing from the remote unit through the bundling cable, are then converted into digital signals after analog-to-digital conversion, enter the FPGA, and in the FPGA, first pass through the digital intermediate frequency module and then enter a digital adding module after DDC and digital filtering.
  • uplink signals of the digital adding module and the cascade optical port are digitally added (digitally combined). Only signals from same antennas and radio frequency channels can be combined.
  • the source unit may be directly a BBU configured to directly demodulate, decode, or perform other baseband signal processing on the digital radio frequency signal transmitted by the digital-analog expansion unit, as shown in FIG. 17 .
  • the source unit may also be an RRU, and the system further includes an access unit connected between the RRU and the digital-analog expansion unit, as shown in FIG. 17 .
  • the access unit may be configured for conversion between radio frequency and digital, perform digital radio frequency signal interaction with the digital-analog expansion unit, and perform analog radio frequency signal interaction with the RRU.
  • the access unit may be provided with 4 optical ports (which may also be other numbers).
  • Optical Port 1 Channel 1 + Optical Port 2 Channel 1 + Optical Port 3 Channel 1 + Optical Port 4 Channel 1 Total Channel 1 signal .
  • total signals of channels 2, 3 and 4 are obtained, then transmitted to corresponding signal intermediate frequency processing links for processing, and finally converted into analog radio frequency signals and transmitted to the corresponding ports of the RRU of 4T4R.
  • downlink four downlink signals are fed into the access module from the ports of the RRU, undergo corresponding radio frequency channel processing, analog-to-digital conversion, and signal intermediate frequency processing, and are then framed.
  • a signal obtained by framing is broadcast to each optical port. That is, a downlink signal of each optical portion may include signals of the channels 1, 2, 3 and 4.
  • the transmission rate is less than 10 Gbps, and an optical module of 10 G and an FPGA may be used, thereby reducing the costs greatly.
  • the digital-analog expansion unit in the embodiment of the present application may feed, on a cable, in a power signal, a TDD switch switching signal and a monitoring signal matching the remote unit.
  • the monitoring signal may be transmitted using a bluetooth signal or using an FSK or other low-speed radio frequency signals, provided that a selected frequency band does not interfere with other signals.
  • a bluetooth frequency band is 2.4 G, which is not in a same frequency band as 2.6 G of a coverage signal.
  • the power supply may normally be a 48-V power supply.
  • the power signal is coupled to the cable by a coupler or combiner with DC coupling for transmission.
  • the TDD switch switching signal may also be directly coupled to the radio frequency cable.
  • a DC power signal passes through a low-pass filter, which filters out a high-frequency signal, and is transmitted to the power conversion circuit to obtain a power supply required by operation of the remote unit.
  • a TDD switch switching circuit may isolate the DC power signal through a DC isolation circuit, which passes through a bandpass filter to obtain a switching signal for uplink and downlink signal switching.
  • the bluetooth chip may be configured to transmit the monitoring signal, which passes through the DC isolation circuit to isolate a DC power signal, and to receive the monitoring signal transmitted by the digital-analog expansion unit after the monitoring signal passes through the bandpass filter.
  • an MCU of the remote unit may also feed the monitoring signal back to the digital-analog expansion unit through the bluetooth chip to realize two-way communication.
  • the downlink radio frequency signal finally covered is also required to be transmitted by the antenna after passing through the DC isolation circuit and the filter.
  • the remote unit since the remote unit uses the radio frequency cable for analog radio frequency signal transmission, the radio frequency cable may cause a signal insertion loss.
  • the use of the daisy chain cascading mode leads to inconsistent lengths of radio frequency cables between the remote units and the digital-analog expansion units on a same daisy chain (that is, the remote cascade chain), as shown in FIG. 21 .
  • the remote unit may amplify the signal through the amplifier to compensate for a cable insertion loss.
  • gains of different remote units are controlled by arranging a digital control attenuator, and the corresponding insertion loss may be matched.
  • a specific process may be as follows.
  • a Microcontroller Unit (MCU) of the remote unit When a remote unit is connected to the digital-analog expansion unit, a Microcontroller Unit (MCU) of the remote unit first establishes a monitoring channel connection with an MCU of the digital-analog expansion unit through the bluetooth chip.
  • the digital-analog expansion unit transmits a bluetooth signal at a fixed power Pt_bluetooth to the cable, which is assumed to be 0 dBm.
  • a cable length may be obtained according to insertion loss characteristics (corresponding to the 2.4 G frequency band of the bluetooth signal) of the cable. Then, an insertion loss value required to cover a signal frequency band (such as mobile 2.6 G) is obtained according to the cable length, and then matching may be performed by adjusting the digital control attenuator.
  • the insertion loss value for 2.6 G is calculated to be 30 dB, and a downlink amplification gain of the remote unit is 50 dB.
  • setting an attenuation value of 20 dB may realize the matching between a remote gain and line insertion loss.
  • output power of the remote unit is greater than that of the digital-analog expansion unit, so the set amount of attenuation is required to be reduced.
  • signal output power of the digital-analog expansion unit is 15 dBm
  • the cable loss is 30 dBm
  • the power to be output by the remote unit is 23 dBm
  • the maximum gain of the remote unit is still 50 dBm
  • a gain control method is provided.
  • the gain control method is applicable to the distributed antenna system described above.
  • the gain control method includes the following steps.
  • the remote unit acquires a radio frequency signal transmitted by the digital-analog expansion unit by means of radio frequency cable, and measures the radio frequency signal, to obtain a first power value.
  • the radio frequency signal is a signal generated by the digital-analog expansion unit according to a preset frequency band and a preset power value.
  • the remote unit obtains a radio frequency signal insertion loss based on the first power value and the preset power value, and obtains a cable length according to the radio frequency signal insertion loss and the preset frequency band.

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Claims (12)

  1. Système d'antenne distribuée, comprenant :
    une unité source ;
    au moins deux unités d'extension numériques-analogiques, l'une des au moins deux unités d'extension numériques-analogiques est connectée à l'unité source par le biais d'une fibre optique, et deux unités adjacentes des au moins deux unités d'extension numériques-analogiques sont connectées en cascade par le biais d'une fibre optique ; et
    au moins deux chaînes en cascade distantes, chaque chaîne en cascade distante incluant une pluralité d'unités distantes connectées en cascade au moyen d'un câble radiofréquence, et une première unité distante de la chaîne en cascade distante étant connectée à l'une des au moins deux unités d'extension numériques-analogiques au moyen d'un câble radiofréquence ;
    dans lequel l'unité d'extension numérique-analogique est configurée pour réaliser, par le biais d'un premier module de traitement de bande de base à l'intérieur de l'unité d'extension numérique-analogique, une opération de traitement de bande de base sur un signal radiofréquence numérique de liaison descendante transmis par l'unité source par le biais d'une fibre optique, et réaliser une conversion numérique-analogique par le biais d'un premier module de conversion de signal à l'intérieur de l'unité d'extension numérique-analogique, pour obtenir un signal radiofréquence analogique de liaison descendante à transmettre à la chaîne en cascade distante ; ou l'unité d'extension numérique-analogique est configurée pour réaliser, par le biais du premier module de conversion de signal, une conversion analogique-numérique sur un signal radiofréquence analogique de liaison montante transmis par la chaîne en cascade distante, et réaliser une opération de traitement de bande de base par le biais du premier module de traitement de bande de base, pour obtenir un signal radiofréquence numérique de liaison montante à transmettre à l'unité source par le biais d'une fibre optique ;
    dans lequel l'unité distante est configurée pour réaliser une interaction de signal radiofréquence analogique avec un dispositif terminal, et deux unités adjacentes des unités distantes effectuant une interaction de signal radiofréquence analogique au moyen du câble radiofréquence ;
    dans lequel l'une des au moins deux unités d'extension numérique-analogique est connectée de manière correspondante à au moins une des au moins deux chaînes en cascade distantes, et chacune des au moins deux unités d'extension numérique-analogique inclut un module frontal radiofréquence connecté à la première unité distante de la chaîne correspondante des au moins deux chaînes en cascade distantes.
  2. Système d'antenne distribuée selon la revendication 1, dans lequel : l'unité d'extension numérique-analogique comprend un premier module émetteur-récepteur optique, le premier module de traitement de bande de base, le premier module de conversion de signal et le module frontal radiofréquence connectés successivement ;
    le premier module émetteur-récepteur optique est configuré pour réaliser une interaction de signal optique avec l'unité source ;
    le premier module de traitement de bande de base est configuré pour réaliser une opération de traitement de bande de base sur un signal reçu, puis émettre le signal ;
    le premier module de conversion de signal est configuré pour réaliser une interaction de signal radiofréquence numérique avec le module de traitement de bande de base et réaliser une interaction de signal radiofréquence analogique avec le module frontal radiofréquence ; et
    le module frontal radiofréquence est configuré pour réaliser une interaction de signal radiofréquence analogique avec l'unité distante et configuré pour réaliser un traitement de signal radiofréquence analogique.
  3. Système d'antenne distribuée selon la revendication 1 ou 2, dans lequel chacune des au moins deux unités d'extension numérique-analogique est en outre configurée pour tramer le signal radiofréquence numérique de liaison descendante transmis par l'unité source, et transmettre le signal radiofréquence numérique tramé à une unité d'extension numérique-analogique adjacente par le biais d'une fibre optique.
  4. Système d'antenne distribuée selon l'une quelconque des revendications 1 à 3, dans lequel l'unité d'extension numérique-analogique est en outre configurée pour :
    si une caractéristique de signal d'un premier signal radiofréquence numérique de liaison montante est identique à celle d'un deuxième signal radiofréquence numérique de liaison montante, combiner numériquement le premier signal radiofréquence numérique de liaison montante avec le deuxième signal radiofréquence numérique de liaison montante pour obtenir un troisième signal radiofréquence numérique de liaison montante d'une unité d'extension numérique-analogique actuelle, convertir le troisième signal radiofréquence numérique de liaison montante pour obtenir un signal optique de liaison montante de l'unité d'extension numérique-analogique actuelle, et transmettre le signal optique de liaison montante à une unité d'extension numérique-analogique d'étage supérieur ou à l'unité source, dans lequel le premier signal radiofréquence numérique de liaison montante est obtenu par traitement du signal optique de liaison montante d'une unité d'extension numérique-analogique d'étage inférieur par l'unité d'extension numérique-analogique actuelle, et le deuxième signal radiofréquence numérique de liaison montante est obtenu par conversion analogique-numérique et traitement de bande de base sur le signal radiofréquence analogique de liaison montante de la chaîne en cascade distante connectée à l'unité d'extension numérique-analogique actuelle par l'unité d'extension numérique-analogique actuelle ; et
    si la caractéristique de signal du premier signal radiofréquence numérique de liaison montante est différente de celle du deuxième signal radiofréquence numérique de liaison montante, convertir le premier signal radiofréquence numérique de liaison montante et le deuxième signal radiofréquence numérique de liaison montante respectivement pour obtenir des signaux optiques de liaison montante correspondants, et transmettre les signaux optiques de liaison montante à l'unité d'extension numérique-analogique d'étage supérieur ou à l'unité source.
  5. Système d'antenne distribuée selon la revendication 2, dans lequel l'unité d'extension numérique-analogique inclut en outre un premier circuit de surveillance, un circuit d'alimentation et un premier coupleur qui est connecté à la première unité distante de la chaîne en cascade distante au moyen d'un câble radiofréquence ;
    le premier coupleur est connecté au premier module de traitement de bande de base, au module frontal radiofréquence, au premier circuit de surveillance et au circuit d'alimentation ; et
    le premier coupleur est configuré pour réaliser au moins l'une des opérations incluant : le couplage de signaux de commutation de liaison montante et de liaison descendante générés par le premier module de traitement de bande de base au câble radiofréquence, le couplage d'un signal d'alimentation au câble radiofréquence, la réalisation d'une interaction de signal de surveillance avec l'unité distante, et la réalisation d'une interaction de signal radiofréquence analogique avec l'unité distante.
  6. Système d'antenne distribuée selon la revendication 5, dans lequel l'unité distante inclut au moins un module de liaison de communication, deux unités distantes adjacentes sont connectées par le biais d'un câble radiofréquence de regroupement, le câble radiofréquence de regroupement inclut au moins un câble radiofréquence, et l'un des au moins un câble radiofréquence est connecté de manière correspondante à un module de liaison de communication d'une unité distante d'étage inférieur.
  7. Système d'antenne distribuée selon la revendication 6, dans lequel : le module de liaison de communication inclut un deuxième coupleur, un circuit d'interaction radiofréquence, un deuxième circuit de surveillance, un circuit de conversion de puissance et un circuit de commutation de liaison montante et de liaison descendante ;
    le deuxième coupleur est connecté au premier coupleur ou à un module de liaison de communication d'une unité distante d'étage supérieur au moyen d'un câble radiofréquence, le deuxième coupleur est connecté au circuit d'interaction radiofréquence, au deuxième circuit de surveillance, au circuit de conversion de puissance et au circuit de commutation de liaison montante et de liaison descendante, et le circuit d'interaction radiofréquence est connecté au circuit de conversion de puissance et au circuit de commutation de liaison montante et de liaison descendante ; et
    le deuxième coupleur est configuré pour réaliser au moins l'une des opérations incluant : l'acquisition d'un signal de puissance, l'acquisition d'un signal de commutation de liaison montante et de liaison descendante, la réalisation d'une interaction de signal de surveillance avec l'unité d'extension numérique-analogique, la réalisation d'une interaction de signal radiofréquence analogique avec l'unité d'extension numérique-analogique, et la réalisation d'une interaction de signal radiofréquence analogique avec l'unité distante d'étage inférieur.
  8. Système d'antenne distribuée selon l'une quelconque des revendications 1 à 7, dans lequel l'unité distante est en outre configurée pour : acquérir un premier signal radiofréquence analogique de liaison montante du dispositif terminal et un deuxième signal radiofréquence analogique de liaison montante transmis par une unité distante d'étage inférieur, et combiner le premier signal radiofréquence analogique de liaison montante avec le deuxième signal radiofréquence analogique de liaison montante pour obtenir un signal radiofréquence analogique de liaison montante d'une unité distante actuelle ; et transmettre le signal radiofréquence analogique de liaison montante à une unité distante d'étage supérieur ou à l'unité d'extension numérique-analogique.
  9. Système d'antenne distribuée selon l'une quelconque des revendications 1 à 8, dans lequel :
    l'unité source est une BBU ou une RRU ;
    si l'unité source est la RRU, le système d'antenne distribuée inclut en outre une unité d'accès connectée entre la RRU et l'unité d'extension numérique-analogique ; et
    l'unité d'accès est configurée pour réaliser une opération de traitement en bande de base sur un signal externe reçu par le biais d'un deuxième module de traitement de bande de base à l'intérieur de l'unité d'accès, et pour réaliser une interconversion d'un signal radiofréquence analogique et d'un signal radiofréquence numérique par le biais d'un deuxième module de conversion de signal à l'intérieur de l'unité d'accès, pour obtenir un troisième signal radiofréquence analogique de liaison montante à transmettre au RRU ou un signal radiofréquence numérique de liaison descendante à transmettre à l'unité d'extension numérique-analogique.
  10. Système d'antenne distribuée selon la revendication 9, dans lequel : l'unité d'accès inclut un deuxième module émetteur-récepteur optique, le deuxième module de traitement de bande de base, le deuxième module de conversion de signal et un module de canal radiofréquence connectés successivement ;
    le deuxième module émetteur-récepteur optique est configuré pour réaliser une interaction de signal optique avec l'unité d'extension numérique-analogique ;
    le deuxième module de traitement de bande de base est configuré pour réaliser un traitement de bande de base sur un signal reçu, puis émettre le signal ;
    le deuxième module de conversion de signal est configuré pour réaliser une interaction de signal radiofréquence numérique avec le deuxième module de traitement de bande de base et réaliser une interaction de signal radiofréquence analogique avec le module de canal radiofréquence ; et
    le module de canal radiofréquence est configuré pour réaliser une interaction de signal radiofréquence analogique avec la RRU et configuré pour réaliser un traitement de signal radiofréquence analogique.
  11. Procédé de transmission de signal, dans lequel : le procédé de transmission de signal est appliqué à un système d'antenne distribuée ; le système d'antenne distribuée inclut : une unité source, au moins deux unités d'extension numériques-analogiques et au moins deux chaînes en cascade distantes, chaque chaîne en cascade distante incluant une pluralité d'unités distantes connectées en cascade au moyen d'un câble radiofréquence, une première unité distante de la chaîne en cascade distante étant connectée à l'une des au moins deux unités d'extension numériques-analogiques au moyen d'un câble radiofréquence, l'une des au moins deux unités d'extension numériques-analogiques étant connectée à l'unité source par le biais d'une fibre optique, deux unités adjacentes des au moins deux unités d'extension numériques-analogiques étant connectées en cascade par le biais d'une fibre optique, l'une des au moins deux unités d'extension numériques-analogiques étant connectée de manière correspondante à au moins une des au moins deux chaînes en cascade distantes, et chacune des au moins deux unités d'extension numériques-analogiques incluant un module frontal radiofréquence connecté à la première unité distante de la chaîne correspondante des au moins deux chaînes en cascade distantes ;
    dans lequel le procédé de transmission de signal inclut :
    l'acquisition, par l'unité distante, d'un premier signal radiofréquence analogique de liaison montante d'un dispositif terminal et d'un deuxième signal radiofréquence analogique de liaison montante transmis par une unité distante d'étage inférieur ;
    la combinaison, par l'unité distante, du premier signal radiofréquence analogique de liaison montante avec le deuxième signal radiofréquence analogique de liaison montante pour obtenir un signal radiofréquence analogique de liaison montante d'une unité distante actuelle, et la transmission du signal radiofréquence analogique de liaison montante de l'unité distante actuelle à une unité distante d'étage supérieur ou à l'unité d'extension numérique-analogique ; et
    la réalisation, par l'unité d'extension numérique-analogique, d'une conversion analogique-numérique et d'un traitement de bande de base sur le signal radiofréquence analogique de liaison montante acquis, pour obtenir un signal radiofréquence numérique de liaison montante à transmettre à l'unité source par le biais d'une fibre optique ; ou
    dans lequel le procédé de transmission de signal inclut :
    la réalisation, par l'unité d'extension numérique-analogique, d'un traitement de bande de base et d'une conversion numérique-analogique sur un signal radiofréquence numérique de liaison descendante transmis par une unité source par le biais d'une fibre optique, pour obtenir un signal radiofréquence analogique de liaison descendante, et transmettre le signal radiofréquence analogique de liaison descendante à la chaîne en cascade distante ; et
    l'acquisition, par l'unité distante, du signal radiofréquence analogique de liaison descendante, et la réalisation d'une transmission de signal radiofréquence de liaison descendante sur la base du signal radiofréquence analogique de liaison descendante.
  12. Procédé de transmission de signal selon la revendication 11, dans lequel : deux unités adjacentes des au moins deux unités d'extension numérique-analogique sont connectées en cascade avec leurs modules émetteurs-récepteurs optiques respectifs, et une première des au moins deux unités d'extension numérique-analogique est connectée à l'unité source par le biais d'une fibre optique ; et
    le procédé de transmission de signal inclut en outre :
    la détermination, par l'unité d'extension numérique-analogique selon que les caractéristiques des signaux multicanaux reçus par une unité d'extension numérique-analogique actuelle sont identiques ou pas, s'il faut combiner numériquement les signaux multicanaux reçus ;
    si une caractéristique de signal d'un premier signal radiofréquence numérique de liaison montante est identique à celle d'un deuxième signal radiofréquence numérique de liaison montante, la combinaison numérique, par l'unité d'extension numérique-analogique, du premier signal radiofréquence numérique de liaison montante avec le deuxième signal radiofréquence numérique de liaison montante pour obtenir un troisième signal radiofréquence numérique de liaison montante de l'unité d'extension numérique-analogique actuelle, la conversion du troisième signal radiofréquence numérique de liaison montante pour obtenir un signal optique de liaison montante de l'unité d'extension numérique-analogique actuelle, et la transmission du signal optique de liaison montante à une unité d'extension numérique-analogique d'étage supérieur ou à l'unité source, dans lequel le premier signal radiofréquence numérique de liaison montante est obtenu par traitement du signal optique de liaison montante d'une unité d'extension numérique-analogique d'étage inférieur par l'unité d'extension numérique-analogique actuelle ; le deuxième signal radiofréquence numérique de liaison montante est obtenu par conversion analogique-numérique et traitement de bande de base sur le signal radiofréquence analogique de liaison montante de la chaîne en cascade distante connectée à l'unité d'extension numérique-analogique actuelle par l'unité d'extension numérique-analogique actuelle ;
    si la caractéristique de signal du premier signal radiofréquence numérique de liaison montante est différente de celle du deuxième signal radiofréquence numérique de liaison montante, la conversion, par l'unité d'extension numérique-analogique, du premier signal radiofréquence numérique de liaison montante et du deuxième signal radiofréquence numérique de liaison montante respectivement pour obtenir des signaux optiques de liaison montante correspondants, et la transmission des signaux optiques de liaison montante à l'unité d'extension numérique-analogique d'étage supérieur ou à l'unité source ; et
    le tramage, par l'unité d'extension numérique-analogique, d'un signal radiofréquence numérique de liaison descendante transmis par l'unité source, et la transmission du signal radiofréquence numérique tramé de manière transparente à une unité d'extension numérique-analogique d'étage inférieur par le biais d'une fibre optique.
EP19933068.9A 2019-06-12 2019-11-27 Système d'antenne distribuée, procédé et appareil Active EP3986011B1 (fr)

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CN110278011B (zh) 2021-04-27
US11923905B2 (en) 2024-03-05
WO2020248529A1 (fr) 2020-12-17
RS67264B1 (sr) 2025-10-31
US20220231763A1 (en) 2022-07-21
EP3986011A1 (fr) 2022-04-20
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